commonly used when describing a nasty, very large, hairy female who may resembele a sasquatch. It is also good to describe a girl with an ugly, nappy, cheap weave in her hair.
"Ew, did you see that girl over there? What a nappy sas."

"You should have seen my teacher, she was the biggest nappy sas i've ever seen."
by Heather iz Limbo April 27, 2007
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